An incredible survival story. Members of two families whose SUV got stuck in a snowbank on a remote mountain road. Trekking almost 20 miles through treacherous conditions to find help. ABC's Alex Perez has more. Reporter: It's the hug two shaken families feared they'd never again share. Will murkle, his daughter megun and John Julian his his kids,samantha and Isaac survived unthinkable. A bone-chilling night in the mountains stranded after a field trip went terribly wrong. The car just slid kind of off the road into the side of the mountain. Reporter: Their SUV stuck in the snow. No gas, no supplies and no cell phone service. The group sang songs and told stories to distract themselves fearing what they might encounter. The scariest thing was when we came across fresh wolf tracks. Reporter: After a long, cold night, Sunday sunrise. They walked 19 miles. The dads encouraging their hungry kids along the way. Well, we told them that they would get a cheeseburger, hot chocolate, fries and a soda. Reporter: They finally found the cabin and phoned their families. My big concern not knowing if they were injured. Reporter: Amazingly everyone is okay. These kids promising next time they'll speak up before they leave. I think the most important thing is that we'd have made more clear where we were going exactly. Reporter: Even the kids picking up tips they'll share with classmates this morning. I'm going to bring extra blankets, sleeping bags, food and more water and pillows. And a tent. Reporter: Lessons from a harrowing trip they'll never forget. For "Good morning America," Alex Perez, ABC news, Chicago.

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